Initial black-screen intermittent on V28 4K monitor

[Flying_Pig]

On startup, using a Display Cable on my new computer, unlike my laptop and its hdmi cable, I had repetitive black screens.

A prior poster on a different monitor solved that issue with the change from the default 59Hz to 60Hz.

So far that seems to have worked for me as well.

However, it doesn't seem to be a fully persistent problem, because when I was hunting for my hdmi cable to test against the new computer which doesn't have that port, the issue went away.  This morning it was more black than lit, so I followed the suggestion above, and it seems to have worked...

[banhien]

@Flying_Pig 

The specs of the monitor

          https://support.hp.com/au-en/document/c06640509#AbT3

What is your computer ? How do you connect them ? What is the version of your HDMI cable ?

Regards.

[Flying_Pig]

Unfortunately, my issue returned with a vengeance the last time I used it.

In between blackouts, I managed to maneuver my mouse over portions of the screen I'd managed to navigate to in order to check the refresh rate.

This time it was 59,997hz, with no opportunity for 60.

And, somehow, in mucking around in both the screen's own setting, and the Windows setting information the blackouts disappeared, suggesting that it was, in fact, a time issue, and not a frequency issue.

But it's beyond frustrating.  The Display and HDMI cables were included with the monitor; I don't know what version(s) they are.  I just know that with the laptop I started with, using a HDMI cable I got from my cable company (Xfinity), there were no issues.

My computer is a Lenovo mini desktop (Lenovo ThinkCentre M800 Small Form Factor PC, Intel Quad Core i5 6500 up to 3.6GHz, 16G DDR4, 240G SSD + 2T HDD, WIFI, BT 4.0, DVD, Win 10 Pro 64-Multi-Language Support English/Spanish/French(Renewed)); it has only a display cable (well, and a VGA) and no HDMI output, so I can't see if there is somehow a cable issue.  However, the behavior (once it settles, it never blacks out) suggests an issue somewhere else. 

Its intermittency is a real head scratcher, but if it's merely a matter of letting the system stabilize, I'm an unhappy camper.  If it's the computer, I'm beyond annoyed, as it's a massive project to migrate all the stuff from my prior computer; the blackouts have not enhanced my progress!

Unfortunately, my laptop doesn't have a Display Cable output, or I'd try that; the fact that once the blackouts stop they don't recur suggests it's not the cable, anyway.

As I got only a fast-start page instructions with the monitor, and the link provided was silent on the matter, what, indeed, is the correct refresh rate?

Thanks...

[Flying_Pig]

Hmmmm.

I have a cure, not that I like having to do it:

If I turn my monitor off and back on, it's stable; never a hiccup.

Is this an anomaly or does it suggest something specific?

The original issue was present regardless of the inlet/outlet combination, and did not occur in a different (laptop) source/different cable (hdmi) application.

As my computer has no hdmi, and my laptop no display port, I could not do a truly equivalent test, but the fact that the problem definitively goes away by cycling the power to the monitor, with no other changes, suggests that the cable itself is not an issue.

Ideas?

Thanks.